It looks like I might have to start photographing some old buildings...

I don't know if this is possible, but... Try to get a ways back from the building, then photograph it with the 35mm f/2.0 (the 1.4 would work as well, but it is 3 times the price and the same sharpness). The 35mm f/2.0 is a VERY good lens. If you can get access to the building across from it, you could take the picture from one of the upper stories, and that would be best of all. Otherwise, depending on your needs (i.e. how close to the building you are forced to stand) any of the other Minolta primes would do well as well (28mm f/2.8, 24mm f/2.8, 24mm f/2.8 20mm f/2.8). Obviously, the closer you are to the building, and the wider the lens, the more pronounced the "keystone" effect will be. This is why I recommended the narrowest lens lens practical, combined with the greatest distance possible. With a really wide lens you can take the picture with the film plane perpendicular to the horizontal, then cut off the bottom half of the picture. This will minimize distortion, but the keystone effect remains. With a darkroom, you can equalize it a bit by tilting print paper so the light falls on it at an angle, essentially reversing the keystone, but this takes some experimentation to get right. Similar things can be done in Photoshop, but expect to spend hours.